<template>
    <div class="app-container">
        <h1>课程列表</h1>

    <!--查询表单-->
    <el-form size=mini :inline="true" class="demo-form-inline">
      <el-form-item>
        <el-input v-model="courseQuery.title" placeholder="课程名称"/>
      </el-form-item>

      <el-form-item>
        <el-select v-model="courseQuery.teacherName" clearable placeholder="讲师名称">
          <el-option :value="teacher.id" v-for="teacher in teachers" :key="teacher.id" :label="teacher.name"></el-option>
        </el-select>
      </el-form-item>

      <el-form-item size=mini>
        <el-select v-model="courseQuery.status" clearable placeholder="讲师头衔">
          <el-option value="Normal" label="已发布"/>
          <el-option value="Draft" label="未发布"/>
        </el-select>
      </el-form-item>

      <el-form-item size=mini label="添加时间">
        <el-date-picker
          v-model="courseQuery.begin"
          type="datetime"
          placeholder="选择开始时间"
          value-format="yyyy-MM-dd HH:mm:ss"
          default-time="00:00:00"
        />
      </el-form-item size=mini>
      <el-form-item>
        <el-date-picker
          v-model="courseQuery.end"
          type="datetime"
          placeholder="选择截止时间"
          value-format="yyyy-MM-dd HH:mm:ss"
          default-time="00:00:00"
        />
      </el-form-item>

      <el-button size=mini type="primary" icon="el-icon-search" @click="queryCoursePage()">查询</el-button>
      <el-button size=mini type="default" @click="resetData()">清空</el-button>
    </el-form>

        <!-- 表格 -->
        <el-table
        :data="list"
        border
        fit
        highlight-current-row>

        <el-table-column
            label="序号"
            width="70"
            align="center">
            <template slot-scope="scope">
            {{ (current - 1) * limit + scope.$index + 1 }}
            </template>
        </el-table-column>

        <el-table-column prop="title" label="课程名称" width="280" />

        <el-table-column label="课程状态" width="90">
            <template slot-scope="scope">
            {{ scope.row.status==='Normal'?'已发布':'未发布' }}
            </template>
        </el-table-column>


        <el-table-column prop="price" label="课程价格" width="100"/>

        <el-table-column prop="lessonNum" label="总课时" width="100" />

        <el-table-column prop="gmtCreate" label="添加时间" width="160"/>

        <el-table-column prop="buyCount" label="销售数量" width="80" />

        <el-table-column label="操作" width="400" align="center">
            <template slot-scope="scope">
            <router-link :to="'/course/info/'+scope.row.id">
                <el-button type="primary" size="mini" icon="el-icon-edit">修改课程基本信息</el-button>
            </router-link>
            <router-link :to="'/course/chapter/'+scope.row.id">
                <el-button type="primary" size="mini" icon="el-icon-edit">修改课程大纲</el-button>
            </router-link>
            <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeDataById(scope.row.id)">删除</el-button>
            </template>
        </el-table-column>
        </el-table>

        <!-- 分页组件 -->
        <el-pagination
            :current-page="current"
            :page-size="limit"
            :total="total"
            style="text-align: center; padding: 30px 0"
            layout="total, prev, pager, next, jumper"
            @current-change="queryCoursePage"
        />
    </div>
</template>

<script>
// 引入调用teacher.js文件
import course from '@/api/edu/course'
import teacher from '@/api/edu/teacher'
export default {
  data() {
    return {
      list: null,// 查询之后接口的返回集合
      current: 1,// 当前页
      limit: 4,// 每页显示的记录数
      courseQuery: {},// 条件封装对象
      total: 0,// 总记录数
      teachers: []// 所有讲师
    }
  },
  created() {
    this.queryTeacherList(),
    this.queryCoursePage()
  },
  methods: {

    // 课程列表带分页
    queryCoursePage(current = 1) {
      this.current = current
      course.queryCoursePage(this.current, this.limit, this.courseQuery)
        .then(response => {
            this.list = response.data.rows;
            this.total = response.data.Total;
        })
    },

    // 讲师列表
    queryTeacherList() {
      teacher.queryTeacherList()
        .then(response => {
          this.teachers = response.data.teachers
        })
    },

    // 删除课程的方法
    removeDataById(id) {
      this.$confirm('此操作将永久删除该课程, 是否继续?', '提示', {
      confirmButtonText: '确定',
      cancelButtonText: '取消',
      type: 'warning'
      }).then(() => {
        // 调用后台删除的方法
        course.deleteCourseById(id)
          .then(response => {
            // 提示信息
            this.$message({
              type: 'success',
              message: '删除成功!'
            });
            // 删除后回到列表页面
            this.queryCoursePage()
          })
      });
    }
  }
  
}
</script>